Flat Framework 2D Hexagonal and Square Packing

The video tutorial explains two types of close packing in two dimensions: square close packing and hexagonal close packing. In square close packing, spheres are arranged in rows where each sphere is in contact with four neighbors, forming a square pattern. This arrangement is referred to as a a a A type, with a coordination number of 4. In hexagonal close packing, spheres are arranged in an ABAB pattern, where each sphere is in contact with six neighbors, forming a hexagonal pattern. The coordination number for this arrangement is 6. The video highlights the differences between these packing types and their respective coordination numbers.

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